20 results about "Rabi frequency" patented technology

Provided are a polariton device, a polariton system, a method of manufacturing the polariton device, and a method of controlling the polariton device. The polariton device includes a cavity including a gain layer including a ferroic material that undergoes a phase transition into an asymmetrical crystal structure in response to an external stimulus, an upper reflective layer formed on top of the cavity, a lower reflective layer formed below the cavity, and a Rabi frequency controller configured to control a Rabi frequency of the polariton device by providing a stimulus to the gain layer.

Quantum reservoir computation is provided. A first feature vector is determined from input data. A plurality of qubits is configured in an initial configuration according to the first feature vector, wherein a detuning, Rabi frequency, phase, and / or position of each of the plurality of qubits is determined by a respective one of the values of the first feature vector. The plurality of qubits is evolved for a first time. The plurality of qubits is measured to obtain first measurements after the first time. The plurality of qubits is returned to the initial configuration. The plurality of qubits is evolved for a second time. The plurality of qubits is measured to obtain second measurements after the second time. A second feature vector is determined from the first and second measurements. The second feature vector is provided to a decoder and a characteristic of the input data is obtained therefrom.

The invention relates to a computer-implemented method, to a computer program and to a computer device as described herein. In particular, the invention relates to a computer-implemented method for solving a computation problem. The invention uses an Ising Hamiltonian in the form (I) wherein n i = (1 - σ i z ) / 2, Ω (t) is the Rabi frequency of the transition and can be dynamically controlled by controlling the power of the coupling laser with time t, Δ(t) corresponds to the detuning with regards to the two-photon transition and can be controlled dynamically by controlling the frequency of the coupling laser with time t, φ (t) is the phase of the laser and can be controlled dynamically. Ω (t), Δ(t) and φ (t) can be controlled independently, wherein the term containing J i,j is the interactions term, for example implemented via a Rydberg blockade mechanism is optionally rendered site-dependent or dynamically tunable, wherein the problem is solved by finding the ground state of the final Hamiltonian.

Systems and methods are disclosed for determining interaction parameters for multiple particles, each particle having a ground state, an excited state, and one or more intermediate states The multiple particles are configured to interact with a plurality of electromagnetic fields associated with a (different) transition between two states. The method comprises performing a spectroscopy measurement, measuring an effective Rabi frequency Ωeff, measuring a single-photon Ramsey frequency ΩR i , and determining the interaction parameters based on the measured effective detuning δ eff, the measured effective Rabi frequency Ωeff, and the measured single-photon Ramsey frequencies ΩR i . The interaction parameters may be determined for each of the multiple particles. The interaction parameters may comprise a single-photon Rabi frequency Ω i for each electromagnetic field, which may be used to align the electromagnetic fields with respect to the particles.

A quantum processing unit comprising : rows comprising first qubits and second qubits, the first qubits and the second qubits being arranged alternatingly within each row, the first qubits and the second qubits forming columns, respectively; a first source configured to drive the first qubits with a first Rabi frequency; a second source configured to drive the second qubits with a second Rabi frequency, wherein two adjacent qubits within each row are subject to a first two-qubit interaction; one in every two columns of first qubits comprises a first special qubit provided between two adjacent second qubits, the first special qubit being such that it is driven with at least twice the first Rabi frequency by the first source, and the first special qubit being subject to a second two-qubit interaction with respect to each of the two adjacent second qubits, and one in every two columns of second qubits contains one second qubit, named second special qubit, such that it is driven with at least twice the second Rabi frequency by the second source.

The present invention provides a method and device for compensating for horizontal acceleration errors in a mobile atomic interferometer gravimeter. Within a single measurement cycle, the method obtains the gravitational phase shift based on the interference loop formed by the interaction between a Raman light pulse sequence and a cold atomic cluster. The method also obtains information on the relative position change of the cold atomic cluster within the horizontal cross-section of the Raman light pulse sequence. Based on this relative position information and pre-acquired characterization information, the method obtains the effective Rabi frequency under the action of horizontal acceleration. The effective Rabi frequency is then compensated to reduce the impact of horizontal acceleration on the atomic interferometer gravity measurement process. Based on the relative position change information and the characterization information, the method obtains the wavefront phase shift introduced by the horizontal acceleration. Based on the wavefront phase shift and the gravitational phase shift, the method obtains a corrected gravitational phase shift. The method then obtains the single-cycle gravitational acceleration based on the corrected gravitational phase shift. This method improves the measurement accuracy of the atomic interferometer gravimeter.

The invention discloses an efficient cascade GHZ state preparation method and application based on a heat insulation rapid channel, and the method comprises the steps: arranging atoms in a laser field according to four scales of the GHZ state, and directly carrying out the preparation of the GHZ state for the initial state of single atom arrangement; for an initial state adopting 2k atom array arrangement, a sequence structure that a ground state space pi g pulse is inserted between two RAP pulses is adopted, and non-adjacent bit ground state space pi g pulses are applied after evolution is finished, so that preparation of a cascade GHZ state is realized. According to the method, the Rydberg interaction spatial modulation characteristic and the adiabatic control robustness are combined by optimizing the Rabian frequency of the RAP pulse and the frequency difference between the laser and the atomic transition energy level, the preparation processes of different scales of GHZ states are unified, the operation complexity is remarkably reduced, and therefore high-fidelity and robustness preparation of the multi-scale cascade GHZ states is achieved.

This invention discloses an automatic calibration method for logic gates based on a neutral atom quantum computing system, and also discloses an automatic calibration method for logic gate fidelity based on a neutral atom quantum computing system. The method performs self-calibration on the fidelity of a two-qubit gate, including 420nm laser pointing self-calibration, 1013nm laser pointing self-calibration, Rydberg excitation Rabi frequency self-calibration, and single-photon Rabi frequency self-calibration; then it performs self-calibration on the ORMD waveform and ORMD phase; and finally, it performs self-calibration on the fidelity of an addressing single-qubit gate, including 795nm Raman light pointing self-calibration and single-qubit gate Rabi frequency self-calibration. This invention performs parameter self-calibration at fixed intervals to ensure that the logic gate fidelity remains at a high level. Without involving the installation of additional high-resolution laser position detectors, it uses a fully automated process to calibrate the fidelity of quantum logic gates, saving space in the physical system and the manpower costs required for calibration.

The invention discloses an atomic internal and external state control method and device for suppressing carrier transition. Firstly, incident light is focused, and a tightly focused light field is generated. Based on spatial parameters of the tightly focused light field, a Rabian frequency with a specific spatial distribution is generated on the ions. The spatial parameters comprise relative positions of ions and the center of the tight focusing light field, and a polarization mode, a spatial mode and an incident direction of incident light. Spatial distribution of the pull ratio frequency is changed by flexibly regulating and controlling spatial parameters, and the quantum gate is constructed according to the changed pull ratio frequency. In order to solve the problems of low control speed and low fidelity of the constructed quantum gate caused by carrier transition in an actual working scene, the method provided by the invention can suppress the carrier transition by changing the pull ratio frequency and reduce the influence of the carrier transition on the construction of the quantum gate, thereby constructing the rapid and high-fidelity quantum gate.

The present application discloses a method and device for manipulating the internal and external states of atoms by suppressing carrier transitions. First, the incident light is focused to generate a tightly focused light field. Based on the spatial parameters of the tightly focused light field, a Rabi frequency with a specific spatial distribution is generated on the ion. The spatial parameters include the relative position of the ion and the center of the tightly focused light field, as well as the polarization mode, spatial mode and incident direction of the incident light. The spatial distribution of the Rabi frequency is changed by flexibly regulating the spatial parameters, and a quantum gate is constructed based on the changed Rabi frequency. In actual working scenarios, carrier transitions can cause the constructed quantum gate to have slow control speed and low fidelity. The method of the present application can suppress carrier transitions by changing the Rabi frequency, reduce its impact on the construction of the quantum gate, and thus construct a fast, high-fidelity quantum gate.

This invention discloses a method, system, device, and storage medium for suppressing energy level leakage, relating to the field of quantum information processing. The method applies parametric modulation to qubits to establish and activate effective exchange coupling between qubits under dispersive coupling conditions, thereby performing a two-qubit entanglement gate operation. During the gate operation, a computational subspace control model and an energy level leakage model are constructed by performing representational and unitary transformations on the system's Hamiltonian. Based on these models, the entanglement gate control pulse is optimized. The energy level correction introduced by the parametric driving is dynamically compensated through modulation of the effective Rabi frequency of time-shaping and time-dependent detuning parameters, thus suppressing energy level leakage from the computational subspace to higher energy levels. Compared with existing technologies, this invention improves the controllability and fidelity of entanglement gate operations under complex energy level structures and is applicable to quantum operations in modular quantum systems.

The invention discloses a method and system for realizing adjustable quantum simulation in ionic crystals, and the method comprises the steps: S1, preparing N target ions in a multi-dimensional ion chain into a unified initial quantum state in an imprisoning system of an ion trap; s2, the control module outputs N radio frequency signals with different frequencies and amplitudes, drives the acousto-optic modulation unit to output N diffracted light beams to N ions, and lasts for a fixed time; s3, the control module obtains the probability that each ion is excited to a set quantum state, and obtains the Rabian frequency of each ion according to the probability; and S4, the control module updates the output of the iteration control module by adopting a feedback control law mode according to the RH frequency of the ions obtained when the ions are measured, the target RH frequency of the ions and the amplitude of the radio frequency signal irradiated to the ions until the RH frequencies of the N target ions reach a preset condition. The invention provides a universal method for realizing any light intensity distribution in multi-ion addressing of an acousto-optic modulation unit.

The invention discloses an optical power compensation method, which comprises the following steps of: determining the Rabian frequency of trapping ions based on control light incident to the trapping ions; wherein the control light is output by the power adjusting module, is transmitted by the transmission optical fiber and is generated after being separated by the polarization light splitting module; performing power compensation on the control light according to the Labar frequency; and verifying the compensated control light based on gate control. By utilizing the method, the trapping ions are used as in-situ sensing probes to directly sense the effective action intensity (namely the pull ratio frequency) of the control light actually received by the trapping ions, and the compensation effect of the control light is verified through gate control verification, so that an indirect feedback mode depending on an external light splitter and a photoelectric detector is abandoned; the stability of light control and the accuracy of quantum gate operation in long-time quantum calculation are remarkably improved, meanwhile, full-automatic operation is supported, and the efficiency and reliability of the system are greatly improved.

A fault arc signal detection method and device based on Rydberg atoms belong to the technical field of power fault detection and solve the problem of how to improve the responsiveness of Rydberg atoms to fault arc signals under non-resonant conditions. The present invention adopts a two-photon cascade excitation method to transition cesium atoms from a ground state to an excited state via a Rydberg state, constructs an EIT spectrum linear model, and adjusts the Rabi frequency of the detection light by changing the detection light power so that the spectrum shows an intermediate state in the process of transition from EIT to EIA, thereby increasing the slope of the spectrum with respect to the fault arc response position, improving the responsiveness of the Rydberg atom system to the fault arc electromagnetic signal under non-resonant conditions, and significantly improving the performance of the Rydberg atom microwave sensing system. The method is applied to the detection of fault arc signals under high-voltage environments and is of great significance for reducing the risk of personal injury and property loss caused by localized discharge faults in various power facilities.

This invention discloses a highly efficient cascaded GHZ state preparation method and its application based on an adiabatic fast channel, comprising: arranging atoms in a laser field according to four scales of GHZ states; for the initial state with a single-atom arrangement, directly preparing the GHZ state; for the initial state with a 2k atom array arrangement, inserting a π space in the ground state space between two RAP pulses. g The pulse sequence structure is used, and a ground state space π is applied after the evolution is complete, consisting of non-adjacent bits. g The laser pulse enables the preparation of cascaded GHZ states. By optimizing the Rabi frequency of the RAP pulse and the frequency difference between the laser and the atomic transition energy level, the spatial modulation characteristics of the Rydberg interaction are combined with the robustness of adiabatic manipulation. This unifies the preparation process of GHZ states of different scales, significantly reduces the operational complexity, and thus achieves high-fidelity and robust preparation of multi-scale cascaded GHZ states.

The present invention provides a laser positioning method and electronic device based on optical tweezers, comprising: obtaining the Rydberg resonance frequencies of at least two atoms captured by a first optical tweezer based on at least two laser powers of a target laser; determining a first single-photon Rabi frequency of the atoms captured by the first optical tweezers and a first laser power corresponding to the first single-photon Rabi frequency based on the at least two laser powers and the at least two Rydberg resonance frequencies; obtaining a second single-photon Rabi frequency of the atoms captured by a second optical tweezers when the target laser is at the first laser power; and determining the relative position of the target laser spot relative to the first and second optical tweezers based on the first and second single-photon Rabi frequencies. The first single-photon Rabi frequency can be determined based on the quantitative relationship between the laser power and the Rydberg resonance frequency, and the equilibrium position of the optical tweezers can be quickly and accurately determined based on the first and second single-photon Rabi frequencies.

The present disclosure relates to quantum computing related methods, systems, and devices for determining a phase modulation function (Φ(t)) for a laser pulse implementing an arbitrary quantum gate for a qubit implemented by a trapped particle, comprising obtaining a Rabi frequency (Ω), and a trap frequency (ω) for the laser pulse and the trapped particle, determining, based on the Rabi frequency (Ω) and the trap frequency (ω), the phase modulation function (Φ(t)) for the laser pulse such as to minimize an effect of a photon recoil of the trapped particle induced by said laser pulse on a gate fidelity of the quantum gate, as well as to a corresponding method for performing an arbitrary quantum gate as well as to a system for modulating laser pulses used to implement one or more quantum gates for a subset of qubits in a quantum register, and to a quantum computer.

The invention relates to a measuring assembly (10) for precisely measuring angles between an antenna (12) and a spin system (16) having at least three crystal axes of which the angles to one another are known, the assembly comprising a light source (20) for generating light, a light sensor (26) for detecting a light signal emitted by the spin system (16), and a microwave generator (18) for generating a microwave signal which is emitted towards the spin system (16) by means of the antenna (12). The measuring assembly also comprises a memory (30) for storing data points for the light signal, the data points comprising information regarding contained Rabi frequencies and / or contained magnetic resonance spectra (ODMR spectra), and an analysis unit (32) for evaluating the data points and for ascertaining a measurement value and for determining the angle between the antenna (12) and the spin system (16) from the measurement value. The analysis unit (32) is designed to process Rabi frequencies in order to ascertain information regarding the angle between the spin system (16) and the antenna (12).

The invention discloses a vector magnetic field self-calibration measurement system and method based on microwave-driven Rabian oscillation, and the method comprises the steps: carrying out the optical polarization of atoms, and applying a plurality of static magnetic fields in known directions as a reference; three microwave polarization ellipse (MPE) modes are excited to drive atoms to generate Lab oscillation, and Lab frequencies of different hyperfine transitions are measured through detection laser; a microwave field vector parameter is solved through multi-direction data fitting, and system self-calibration is achieved; and measuring the Rabian frequency in the magnetic field to be measured under the calibrated microwave field, and performing inversion to obtain complete vector information of the magnetic field. According to the invention, atoms are used as a built-in reference and a sensor at the same time, an external standard magnetic field or mechanical rotation is not needed, high-precision, full-automatic and self-calibration vector magnetic field measurement is realized, and the device has the advantages of simple structure, strong anti-drift capability, high measurement precision and the like.

A quantum processing unit comprising: first qubits and second qubits arranged alternatingly, wherein each two adjacent qubits are subject to a first two-qubit interaction, wherein each qubit is adjacent to at least two qubits; a first source configured to drive the first qubits with a first Rabi frequency; a second source configured to drive the second qubits with a second Rabi frequency; and a set of mediator qubits.